Hydraulic press



July 1s, 1933. H, MSK/w EI-AL 1,919,070

HYDRAULI C PRE S S #Meri mummy E102 raw/967 999 elf/hm July 18, 1933. H.J. MCKAY ET AL HYDRAULIC PRES S 2 Sheets-Sheet 2 Filed March l, 1930 2J:zy

nvewfow Patented July 18, 1933 UNITED stares HOBART J'. MCKAY AND PAULJ. CARLSEN,

CORPORATION' OF OHIO PTENTOFFICE or str Pri-or., Minimsornynssrenons,.BYMnsNE ASSIGNMENTS, To uns nrcrmnnson coivrreuY, `or LOGKLAND, cmd-A nirYnnAULic Panes Application filed 1,

This invention relates to improvements in hydraulic presses and moldstherefor. Heretofore in the operation of hydraulic presses, andparticularly those of the heavy duty'type where pressures ofmanythousands of pounds per square inch are applied in the molds, muchdifficulty has been experienced in separating the mold plates from themolded object after the object has been formed. It will beunderstoodthat the high pressures in the mold force the plasticV"material into the minutest openings, recesses andthe like, and thiscauses an interlocking and strong adherence between the molded objectand moldk which is capable of resisting considerable force tending toseparate the mold from the object. rlhis is particularly true intheformation of irregular objects with reentrant surfaces which must bedrawn apart against considerable friction. Y These difliculties haveresulted in relatively slow operation and unnecessary fatigue of theoperators.

It is our object to provide a mold adapted to facilitate the removal ofthe molded object by automatically breaking the seal between the moldand object. Our invention also includes certain other novel features o fconstruction which will be more fully pointed out in the followingspecification and claims.

Referring to the accompanying drawings` which illustrate the best formof ourdevice at present known vto us, Fig. 1 isr'a central verticalsection ,through our improved mold and showing its mounting in aheavy'duty hydraulic press of common type; Fig. 2 is a similar view on alarger scalev of the inold, ring and platen parts of the press;` Figsand l are diagrammatic sectional views showing` suitable valves forcontrolling the press; Fig. 5 isanother central vertical sectienVshowing the plunger and moldin oper ative relation and lwith the moldedobj-ect in the mold and Fig. 6 is a perspective'view of the mold in openposition together with the adjacent portion of the ring with lthe top ofthe ring cut away to show the hinge connections for the side plates.

We have illustrated a 'mold adapted to l: form a storage batteryboX orcontainer 7 of common type, but it willbe understood that 1930. V,SerialN0. 432,496.

B ituminous material, such as asphalt and kgilsonite, has been mlXedA insuitable proportions with fibrous material and ailler to constitute 'aplastic compositionfor use in mease ured quantities to form thecontainer 7 The press illustrated is lof the type'having large and smallhydraulic cylinders 8 and` 9 ref spectively for rams 10 and'll. Thecylinders 8 and 9 are supported in a suitable frame consisting of largevertical members 12 connected by cross members 13 and supported on a,foundationl 15. The large ram 10 is adapted' to be driven downward, byfluid under pressure supplied through a pipe 16, to extend a plunger 17into the mold, as best shownin Fig. 5. Upon the foundation is posedhorizontally in the ring, being freelyl movable` upward therein.Iingedly connected ,to the side edges of the bottom 20 are pairs ofVside plates`21 and 2 2 for forming the exterior of the container i7.These side ,plates 21 and 22 are connectedto the bottom 20 Aby hingepins23 and are freetofpivot outward fromthe container 7 when' the moldis extended from the ring 19. as illustrated.

in Fig. 2. The end edges of the plates 21 and v22` are'formed to fitsnugly together when the plates are` retracted and confined within thering 19 suitable rabbeted edges 24 being arranged to fittogetherandprevent escape of the plastic material at the corners. 'A A ProjectingIfrom the outer surfaces of the plates 21 are lugs 25 V.formed toengagethe outer surfaces of guide flanges 26v extending along slots 27 in theinner surfaces of the ring 19. These guide flanges 26, at opposite sidesof the ring, diverge slightly from each other upward so as to positivelydraw the sideplates 21 apart when the mold iseXtended ico K ring 19. Thelugs 25 are preferably formed with threaded shanks which are screwedinto tapped holes in the plates 21 and held against turning by suitableset screws 23.l The plates 22 are provided with lugs 25a coacting withguide flanges 26a, like the lugs 25 and flanges 26. Y

To eject the mold from the ring 19 and cause the plates 21 and 22 toproject there-- from we provide a small ram 29. This rain is movableaxiallyupward in the'ring from an opening in the platen 1S and aVsuitable y hydraulic cylinder- 30 extends downward from the -platen andis supplied at yits lower end with i'iuid under pressure from a pipe 31(Fig. 1). Locking bolts 32 are removably mounted in horizontal openingsin the ring 19 and arranged` to be extended into recesses 32a in theplates 21. To operatethese locking bolts 32, levers 33, as best shown inFig. 6, are pivotally connected to the outer ends of the bolts and eachlever has a fulcrum support consisting of brackets 23 secured to thering 19 and a pivot pin 35 extending through perforations in saidbrackets and in the lever 33.

It will be understood that the plunger 17 is constructed to form theinterior of the container 7 or other obj ect to be formed. In the pressillustrated, the small ram 11 is employed to withdraw the plunger 17upward after an object has been molded. A cross head 36 is secured tothe upper end of the ram 11 and is connected by downwardly extendingrods 37 to a top platen 38 carrying the plunger 17. A suitablearrangement of valves and piping for operating the -several rams 10,11and 29 is shown in Figs. 1, 3 and 4. Thus water, or other suit-ablefluid, under pressure may be supplied from a pipe 39 having a branch 40communicating with a valve casing 41 and a branch 42communicating with avalve casing 43. An exhaust pipe 44 has a branch 45 for the valve casing41, and a. branch 46 for the valve casing 43. The pipe 16 for supplyingthe large ram cylinder 8 is connected to the valve casing 41 and anotherpipe 47 connects said casing with the cylinder 9 for the rain 11. Thepipe 31 communicates with the casing 43. Movable by ahandle 49, from thefullline to the dotted line position shown in Fig. 3, is a valve member48 in the casing 41 and in the valve casing 43 is mounted aI valvemember 50 which is movable by a handle 51 to placeeither the pipe 42 orthe pipe 46 in communication with th-e pipe 31. When the valve member 4Sis in the full line position shown in Fig. 3, fluid under pressure isadmitted to the cylinder 9 while fluid fromA the cylinder 8 is allowedto exhaust through the pipes 45 and 44. When this valve is in the dottedline position, fluid under pressure is supplied to the large cyliny der8 and fluid from the cylinder 9 is allowed to exhaust.

In operation, assuming that the several parts of the device are in theposition shown in Fig. 1, a measured quantity of moldable material maybe placed in the mold and then the valve handle 49 is operated to extendthe ram 10 carrying the plunger 17 downward into the mold, whileexhausting fluid from the cylinder 9. This closes the mold, as shown inFig. 5, and forms the container 7. Before the plunger 17 Vis withdrawnfrom the mold the levers 33 are operated to extendthe lockingbolts 32into the recesses 32a in the plates 21. The locking bolts being soextended, movement of` the mold upward through the ring 19 is preventedand the handle 49 may be koperated to exhaust the cylin- Y der 8 andsupply fluid under pressure to the cylinder 9. This operation ofv thevalve causes the ram 11 to raise the upper .platen 38 therebywithdrawing'the plunger 17 from the mold. The levers 33 are now operatedto withdraw the locking lingers 32 and the valve handle 51 is moved tosupply fluid under pressure to the ram cylinder 30 with the result thatthe ram, engaging the bottom 2O of the mold, thrusts said bottom upwardtogether with the side plates and molded object. During this upwardmovement the lugs 25 are drawn apart as they slide along theupwardlydiverging yguide flanges 26, thereby breaking the seal'between themolded object and plates.` Zhen the mold is *fullyv extended, as shownin Fig. 2, the plates 21 readily tilt outward and plates 22 aresimilarly separated from the object. Finally, the completed container 7is merely lifted out ofthe mold and after a simple cleaning operationthe valve handle v51 is manipulated to exhaustthe"ram'cylinder 30 andallow the mold and ram 29 to return by gravity to normal position withinthe ri 19. This completes a cycle of operation.`

By hingedly connecting the side plates to the bottom of the vmold' theoperations-of opening and closing the mold arev facilitated and' properpositioning of the sides in sealed relation to the bottom (when the moldis closed) is assured. Our improvements reduce the manual work and makeit possible for an operatorV to produce a substantially 'leo largernumber of containers or other molded objects in a given period of time.

Having described our invention whatwe claim as new and desire to protectby Letters Patent is:

1. In a'mold for a press having a plunger, a platen and a ring securedto said platen, a mold bottom normally Aresting on said platen Withinsaid ring, .sides hingedly connected to said bottom and arranged to beconfined Within said ring to form a mold With an open top, said plungerbeing arranged to be extended into the top of said mold to form anobject, means for forcibly projecting said sides from the top of saidring, upwardly and outwardly diverging cams formed on opposite sides ofsaid ring and means projecting from the mold sides to'engage said camsfor opening said sides outward relative to the molded object when themold is extended from the ring. l

2. In a mold for a hydraulic press having a plunger, a platen and a ringsecured toV said platen, a `substantially rectangular'mold resting onsaid platen Withbottomfnormaly es hingedly connected to said in saidring, si

vbottom and arranged to v*be conned Within said ring-to form a mold withan open top, said-plunger being arranged to be extended into said moldto form an object, means for forcibly projecting said sides from saidmold, lugs projecting from the outer surfaces of said sides and guidesformed in said ring to engage said lugs and forcibly pivot certain ofsaid sides outward when the mold-

